Vulnerability in Go-Vikunja Vikunja
CVE-2026-123521
Vikunja before 2.7.1 contains an improper restriction of excessive authentication attempts vulnerability that allows session holders to brute-force account passwords via unthrottled re-authentication endpoints. Attackers with a stolen session can guess the password via /user/settings/totp/disable without lockout, then disable TOTP without a code for persistent account takeover.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/go-vikunja/vikunja/security/advisories/GHSA-49pj-52x6-8gpj (vendor-advisory)
- www.vulncheck.com/advisories/vikunja-before-2.7.1-password-brute-force-via-totp… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123521?
- CVE-2026-123521 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 5.9/10. Published 2026-11-08.
- How severe is CVE-2026-123521?
- Medium severity. CVSS v3 base score is 5.9 out of 10.